Long ago, the astrophysicist Inigo began dreaming scenes from the life of the remarkable Edeard, who lived within the Void, a self-contained microuniverse at the heart of the galaxy. Inigo's inspirational dreams, shared by hundreds of millions throughout the galaxy, gave birth to a religion: Living Dream. But when the appearance of a Second Dreamer seems to trigger the expansion of the Void--which is devouring everything in its path--the Intersolar Commonwealth is thrown into turmoil.

With time running out, the fate of humanity hinges on a handful of people: Araminta, now awakening to the unwelcome fact that she is the mysterious Second Dreamer; Inigo, whose private dreams hint at a darker truth; and Justine, whose desperate gamble places her within the Void, where the godlike Skylords hold the power to save the universe . . . or destroy it.